Dialog中EditText不能自动弹出输入法解决方法

1.自定义dialog

Dialog dialog = new Dialog(MainActivity.this, R.style.dialog);
dialog.setContentView(R.layout.dialog);
dialog.setCanceledOnTouchOutside(true);
dialog.setCancelable(true);
final EditText edt = (EditText) dialog.findViewById(R.id.edt);

2.设置监听
dialog.setOnShowListener(new DialogInterface.OnShowListener() {
            @Override
               public void onShow(DialogInterface dialogInterface) {

		3.弹出软键盘
                InputMethodManager  im = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
                im.showSoftInput(edt, InputMethodManager.SHOW_IMPLICIT);
                }
               });
dialog.show();